47results about How to "No secondary waste" patented technology

The invention relates to a method for producing formed coke, in particular to a method for preparing coal powder into the formed coke by microwave. The method adopts coal powder as raw material and comprises the following steps: sieving the coal powder for preparing fine coal powder, sending the fine coal powder into a first microwave heating device for dehydration until the water content of the heated fine coal powder is below 1 percent, and sending the heated fine coal powder into a second microwave heating device by a conveying device for dry distillation; performing the dry distillation to the fine coal powder by the second microwave heating device to analyze other materials in the coal powder, preparing carbocoal after the dry distillation, sending the carbocoal into a mixer by the conveying device to prepare the mixture after adding bonding material; sending the mixture to a forming machine by a conveyer for forming so as to prepare a formed coke semi-finished product; sending the reformed coke semi-finished product into a third microwave heating device for being heated and carbonized to prepare red coke, and sending the carbonized red coke into a coke car to prepare a formed coke product. The invention has low production cost, high production efficiency, cleanness and environment protection because coke powder and waste are not produced during the production.

The invention discloses an efficient biochemical nitrogen and phosphorus removal method for waste water. Ammonia nitrogen and phosphorus in waste water are efficiently removed by combining a modified A2/O biological nitrogen and phosphorus removal technology and a chemical method, namely, zeolite adsorbing ammonia nitrogen method; the denitrification liquid flowing out from an anoxic denitrification tank enters an aerobic nitration tank to form internal circulation; the residual denitrification liquid directly enters a sedimentation tank for solid-liquid separation; phosphorus-accumulating bacteria directly flows back to an anaerobic tank from the sludge of a sedimentation tank, and then enters the anoxic nitration tank. Ion adsorption and biological regeneration treatment are combined; water outlet total nitrogen is less than or equal to 5 mg/L; the removal ratio of total nitrogen and total phosphorus is more than 90%; requirements that water outlet total nitrogen in Taihu basin chemical engineering zone is superior to the primary standard, namely, the A standard, of the urban sewage treatment plant pollutant discharge standard (GB18918-2002) are met stably.

The invention provides a method for recycling uranium in uranium-contained waste water. The method is characterized by recycling and enriching the uranium in the waste water through the steps of ammonia removal of the waste water as well as pretreatment of organisms, uranium adsorption by chromatographic columns, scouring by acid solution and deposition. The method is high in recycling efficiency, low in cost, free from producing secondary waste liquid, compact in technological flow, applicable to the treatment of different uranium-contained waste liquid and high in practicability.

The invention provides a thallium-containing wastewater strongly oxidizing, coagulating, adsorbing and recovering process. The process includes the following procedures: thallium-containing wastewater concentration, pH regulation, strong oxidization, coagulation, flocculation, precipitated sludge treatment, pH regulation, solid impurity filtration, removal of Zn, Pb, Cd and Tl, and the like. The process has the beneficial effects that the process has the advantages of advanced technology, maturity, good effluent quality, stability in operation, conciseness in process, strong practicability, easiness in start and stop, convenience in maintenance and management, small investment, low operating cost, small floor area for construction, short construction period and large application ranges of projects; treatment of heavy metal ion polluted sewage is not limited by temperatures; the limitation that a biological method can not be used in cold regions in the north can be overcome.

The invention relates to a method for treating production waste of phosphorus industry and recycling phosphorus from the treated production waste, which includes performing high-temperature oxidation of the waste at the temperature of from 250 DEG C to 1200 DEG C by enabling the production waste of phosphorus industry to contact with oxygen-containing gases, and recycling the obtained solid products. By using the method, use of expensive drugs can be avoided, and secondary waste which is hard to deal with cannot be produced. Production waste liquid of phosphorous pesticides can be converted into matters such as pyrophosphate, polyphosphates, metaphosphate, orthophosphate and the like. The matters can be applied to other chemical industrial productions, so that phosphorus elements can be recycled and utilized.

The invention relates to a preparation method of an aluminum calcium carbonate composite cementing material and a product thereof. The preparation method comprises following steps: (1) adjusting the calcium and silicon contents of red mud, and carrying out heat activation, cooling, water washing, and drying to obtain thermally activated red mud; and (2) mixing thermally activated red mud, cement,and an auxiliary cementing material, adding water, curing molding, and then performing CO2 mineralization enhancement to obtain the aluminum calcium carbonate composite cementing material. The methodhas the advantages that red mud can adapt to the technical characteristics of CO2 mineralization enhancement; low value red mud with a high alkali content is utilized, and the low carbon benefits of building materials are maximized.

A process for treating the As-contained alkaline waste dregs includes such steps as immersing in water to remove ash and obtain dregs and As alkali contained solution, returning the dregs back to production line for recovering valuable metals, adding ammonium salt to said solution for neutralizing alkali, heating to volatilize ammonia and CO2, absorbing them by a mother for preparing ammonium hydrogen carbonate or sodium carbonate, adding As precipitant to deposit As, and using the residual solution to prepare sodium salt. Its advantage is no secondary pollution.

The invention discloses a waste plastics pretreatment process based on coking by a coke oven, which solves the problems of low equipment life, large environmental influence and influenced coke quality after coal blending in the process of treating waste plastics by using the coking process in the prior art. The technical scheme adopted by the invention is as follows: (1) performing coarse crushing on the waste plastics by a crusher until the grain size is 8-12mm; (2) feeding the waste plastics with the grain size of 8-12mm after coarse crushing in a pyrolysis oven, heating to 225-275 DEG C under the condition of air isolation, pyrolyzing for 30-90min at a constant temperature and dissolving out pyrolysis gas; (3) cooling the fluid residue of the waste plastics after pyrolysis to form solid-state solids, and feeding the solid-state solids in the crusher again for crushing until the grain size is no more than 1mm; and (4) blending the solid-state solids in coking coal according to the proportioning of 1% by weight. The invention has the advantages of simple process, no environment pollution and no influence on coke quality.

The invention relates to a method for preparing geopolymer by utilizing waste acid sludge. The method is characterized by comprising the following steps: mixing waste acid sludge powder, modified magnesium slag powder and bauxitic clay powder, wherein the weight ratio of the waste acid sludge to the modified magnesium slag is 1:1-3, and the addition amount of bauxitic clay accounts for 20%-60% by weight of the total mixed powder; then mixing a NaOH solution with the mass concentration of 20-50% and a water glass solution with the mass concentration of 5-50% according to the volume ratio of 3:1-3, then pouring into the above mixed powder, uniformly stirring, and then pouring a die for molding; and finally demolding and maintaining. The provided processing method is clean and environment-friendly, is applicable to solidify heavy metal Cd in the waste acid sludge, and is low in cost. The preparation technology is simple, does not need high-temperature sintering, does not employ expensive materials, is easy to construct, and is suitable for industrialized production.

The invention discloses a material for adsorbing uranium from a basic nuclear waste liquid and a preparation method of the material. The material for adsorbing uranium from the basic nuclear waste liquid is prepared from a polymer PPN-6 as a matrix by connecting short-chain quaternary phosphonium salt with the chlorinated carbon atom number being 1-4 onto a benzene ring of PPN-6. The material hasquite high adsorption capacity on uranyl tricarbonate, and has quite high adsorption selectivity and faster adsorption kinetics, a back extraction agent of the material is diluted hydrochloric acid, and besides, a back extraction method is very simple and convenient and has good recyclability; the material can be incinerated after being repeatedly used, and no secondary waste is produced.

The invention relates to a method for recycling fluorine-containing sulfuric acid. The method comprises the steps of under normal pressure, adding a certain amount of deionized water into a reaction kettle filled with fluorine-containing sulfuric acid, with the addition amount of the deionized water being 90 to 120% of the theoretical water amount required for hydrolyzing fluorosulfonic acid in fluorine-containing sulfuric acid; introducing inert gas which does not react with sulfuric acid, hydrofluoric acid and water, heating, collecting tail gas, and absorbing with deionized water to obtain hydrofluoric acid; and fluorine-free sulfuric acid being left in the reaction kettle. After treatment, fluorine-free sulfuric acid is finally left in the reaction kettle, and the concentration of the sulfuric acid is 80 to 98%; the content of hydrofluoric acid is below 10ppm; after the tail gas is absorbed by the deionized water, hydrofluoric acid with the concentration of 30 to 48% is obtained, and the content of sulfuric acid is 20 ppm or below. Therefore, after the fluorine-containing sulfuric acid is treated by adopting the method disclosed by the invention, high-concentration and high-purity sulfuric acid and hydrofluoric acid which are directly commercialized or produced and applied can be obtained.

The method relates to a method for curing lead in fouling acid slag. The method is characterized by comprising the following steps that modified magnesium metal slag is added to the fouling acid slag after drying and grinding first, the modified magnesium metal slag and the fouling acid slag are mixed uniformly and then briquetted, and the obtained briquettes are placed in a sintering furnace for heat preservation under the temperature of 500-900 DEG C for 0.5-6 hours and are cooled and taken out. The method is a clean environmental protection treatment method for curing heavy metal Pb in the fouling acid slag, the modified magnesium slag of curing agents is magnesium metal smelting reducing slag, the purpose of waste control by waste is achieved, and therefore cost is low. The curing process for the fouling acid slag is simple, expensive materials are not used, and a project is easy to implement, so that industrialized operation is achieved; secondary waste slag, waste water and waste gas are not generated in the curing process, and the method can be implemented under safe and environment-friendly conditions.

The invention belongs to the field of building materials, and particularly relates to a method for preparing high-strength permeable concrete by high-iron low-quality coal ash serving as a main raw material. Compared with traditional cement-based permeable concrete, the method has the advantages that the activity of the low-quality coal ash is improved by pretreating the coal ash, the use ratio ofthe coal ash is 100%, the adding amount of the coal ash in a product is not lower than 80%, mineral consumption and CO2 emission are reduced, secondary products are avoided, waste is used, environments are protected, the potential destructive effect of iron on the concrete is reduced by pretreatment, the pigment effect of iron in the coal ash is sufficiently achieved, red permeable concrete can be prepared without adding pigments, the early strength of a product mainly prepared from the low-quality coal ash is improved, the compressive strength of standard curing 1d can reach 20MPa, the strength of standard curing 3d can reach 30-40MPa, permeable rate is not lower than 2mm/s, special curing is omitted, strength development is rapid, production cycle is shot, and production cost can be greatly reduced.

The invention discloses a radioactive waste curing method and application thereof. The radioactive waste curing method includes the following steps: (1) mixing an epoxy resin curing material and radioactive waste so as to obtain a mixture; and (2) performing maintenance curing on the mixture so as to obtain an epoxy resin waste cured body. According to the curing method, curing treatment is performed on low-and-medium level radioactive waste through the epoxy resin curing material, the curing method with high adaptability to the to-be-treated waste, a large tolerance rate of waste and excellent cured body performance is provided for treatment of the low-and-medium level radioactive waste, disposal requirements of the radioactive waste in China can be met, and no secondary waste is generated through the curing method.

The invention discloses a comprehensive processing method for waste through production of phthalic anhydride. The phthalic anhydride is produced by employing an air gas phase oxidation process, the waste comprises waste silica-gel spheres generated from a dehydration sublimation process of a production system, industrial exhaust gas discharged from a trap at an end of a production system, and organic waste water generated during hydrolysis of phthalic anhydride; and the processing method comprises the following steps: 1) waste silica-gel sphere processing; 2) tail gas recovery; 3) organic waste water processing; and 4) waste liquid processing. The comprehensive processing method for waste through production of phthalic anhydride can process and recover all wastes in a solid state, a liquid state or a gas state generated during production of phthalic anhydride, and the wastes enable reasonable recovery and utilization, no secondary refuse is generated, and the comprehensive processing method has the advantages of simple process, high enforceability, low energy consumption, and excellent comprehensive properties.

The invention relates to the field of solid waste treatment, in particular to a method of treating sludge by adopting a self-propagating pyrolyzation device coordinated with a cement plant. The methodcomprises the following steps: by pyrolyzing sludge by means of the self-propagating pyrolyzation device, distributing the pre-treated sludge as a material on a chain belt/trolley below a distributorof the self-propagating pyrolyzation device to form a material bed; preheating the material bed by waste heat flue gas of the cement plant; then pyrolyzing the material bed by heat generated by combustion of fuel gas, wherein organic matters in the material bed form a gas compound; introducing the gas compound along with pyrolyzed flue gas into a decomposing furnace of the cement plant; then feeding the same into a flue gas purification system of the cement plant; and feeding the sludge ash residues formed by the pyrolyzed material bed as cement clinker into a cement clinker system. The method has the obvious advantages that a cement kiln is high in treatment temperature, large in incineration space, long in incineration standing time, large in treatment scale, free of secondary slag emission and the like. Meanwhile, the method also solves the problem of reconstruction cost and influence on production as a result of high water content of household sludge.

The invention discloses a preparation method of an adsorption filter element used for treating a radioactive waste liquid and the adsorption filter element. According to the high-density extrusion process molding provided by the invention, the filter element has a compact structure and high mechanical strength, and conditions of damage and leakage of micro-particles do not occur during use; and the filter element is formed by high-density extrusion molding of microporous materials such as zeolite powder, bentonite, kaolin, graphene, aluminum oxide and the like, the filter element has a compactstructure and the characteristics of a large adsorption surface area, high adsorption capacity and high adsorption efficiency.

The invention belongs to the technical field of water treatment, and particularly relates to a treatment method of high-concentration high-salt methanol organic wastewater. The wastewater is sequentially subjected to steam stripping, wet catalytic oxidation, resin adsorption, distillation and biochemical treatment. Methanol recovery liquid generated in the wastewater treatment process can also be used as a resin regeneration liquid and/or a carbon source, a byproduct sodium chloride salt can be obtained by distilling the treated effluent, and meanwhile, the wet catalytic oxidation can also be used for oxidation treatment of the resin regeneration liquid and distillation still residues. According to the invention, organic matter in wastewater can be reasonably and effectively treated, the final effluent reaches the discharge standard of a park, the purpose of treating waste with waste is realized, and the problems of low treatment rate, poor treatment effect and large hazardous waste output in the prior art are solved.

A treatment method for harmless solid waste comprises the steps that firstly, inorganic oxide particles or hydroxide and a slow release agent are mixed to form a mixture; secondly, the prepared mixture and phosphoric acid are mixed to form an acid solution; thirdly, the acid solution and waste particles are mixed to generate a sizing agent; and fourthly, the sizing agent is solidified. The treatment method for the harmless solid waste is characterized in that oxide grains are fed into a plasma furnace through inorganic oxide to be roasted and then are cooled and pulverized, the temperature applied to the plasma furnace is raised every 10 minutes from the first temperature, in this way, roasting is carried out for 20 minutes, 40 minutes later, the second temperature is reached, and then constant roasting is carried out for 40 minutes at the second temperature to 120 minutes. The method is used for producing building materials, no secondary waste is generated, and the building materialswith low price and free of harmful gas emission can be generated.

The invention discloses a system and method for zero discharge of magnesium oxide method desulfurization wastewater, and belongs to the field of environmental protection. The system comprises a magnesium oxide method desulfurization absorption tower and a hot method decrement device, flue gas generated after boiler combustion is connected with the magnesium oxide method desulfurization absorptiontower sequentially through an air preheater and a dust remover, the output end of the bottom of the magnesium oxide method desulfurization absorption tower is connected with a waste water tank, and the output end of the bottom of the waste water tank is connected with the hot method decrement device. The output end of the bottom of the thermal decrement device is connected with a sedimentation tank, the output end of the top of the sedimentation tank is connected with a spray drying tower through a clear liquid tank, and the bottom end of the spray drying tower stores a target product. The system and method have the characteristics of low system investment, high additional value of byproducts, no secondary waste and the like.